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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/single_split_view.h"
#include "skia/ext/skia_utils_win.h"
#include "ui/base/accessibility/accessible_view_state.h"
#include "ui/gfx/canvas.h"
#include "ui/views/background.h"
#include "ui/views/controls/single_split_view_listener.h"
#if defined(USE_AURA)
#include "ui/aura/cursor.h"
#endif
namespace views {
// static
const char SingleSplitView::kViewClassName[] =
"ui/views/controls/SingleSplitView";
// Size of the divider in pixels.
static const int kDividerSize = 4;
SingleSplitView::SingleSplitView(View* leading,
View* trailing,
Orientation orientation,
SingleSplitViewListener* listener)
: is_horizontal_(orientation == HORIZONTAL_SPLIT),
divider_offset_(-1),
resize_leading_on_bounds_change_(true),
listener_(listener) {
AddChildView(leading);
AddChildView(trailing);
#if defined(OS_WIN)
set_background(
views::Background::CreateSolidBackground(
skia::COLORREFToSkColor(GetSysColor(COLOR_3DFACE))));
#endif
}
void SingleSplitView::Layout() {
gfx::Rect leading_bounds;
gfx::Rect trailing_bounds;
CalculateChildrenBounds(bounds(), &leading_bounds, &trailing_bounds);
if (has_children()) {
if (child_at(0)->visible())
child_at(0)->SetBoundsRect(leading_bounds);
if (child_count() > 1) {
if (child_at(1)->visible())
child_at(1)->SetBoundsRect(trailing_bounds);
}
}
SchedulePaint();
// Invoke super's implementation so that the children are layed out.
View::Layout();
}
std::string SingleSplitView::GetClassName() const {
return kViewClassName;
}
void SingleSplitView::GetAccessibleState(ui::AccessibleViewState* state) {
state->role = ui::AccessibilityTypes::ROLE_GROUPING;
state->name = accessible_name_;
}
gfx::Size SingleSplitView::GetPreferredSize() {
int width = 0;
int height = 0;
for (int i = 0; i < 2 && i < child_count(); ++i) {
View* view = child_at(i);
gfx::Size pref = view->GetPreferredSize();
if (is_horizontal_) {
width += pref.width();
height = std::max(height, pref.height());
} else {
width = std::max(width, pref.width());
height += pref.height();
}
}
if (is_horizontal_)
width += kDividerSize;
else
height += kDividerSize;
return gfx::Size(width, height);
}
gfx::NativeCursor SingleSplitView::GetCursor(const MouseEvent& event) {
if (!IsPointInDivider(event.location()))
return gfx::kNullCursor;
#if defined(USE_AURA)
return is_horizontal_ ?
aura::kCursorEastWestResize : aura::kCursorNorthSouthResize;
#elif defined(OS_WIN)
static HCURSOR we_resize_cursor = LoadCursor(NULL, IDC_SIZEWE);
static HCURSOR ns_resize_cursor = LoadCursor(NULL, IDC_SIZENS);
return is_horizontal_ ? we_resize_cursor : ns_resize_cursor;
#endif
}
void SingleSplitView::CalculateChildrenBounds(
const gfx::Rect& bounds,
gfx::Rect* leading_bounds,
gfx::Rect* trailing_bounds) const {
bool is_leading_visible = has_children() && child_at(0)->visible();
bool is_trailing_visible = child_count() > 1 && child_at(1)->visible();
if (!is_leading_visible && !is_trailing_visible) {
*leading_bounds = gfx::Rect();
*trailing_bounds = gfx::Rect();
return;
}
int divider_at;
if (!is_trailing_visible) {
divider_at = GetPrimaryAxisSize(bounds.width(), bounds.height());
} else if (!is_leading_visible) {
divider_at = 0;
} else {
divider_at =
CalculateDividerOffset(divider_offset_, this->bounds(), bounds);
divider_at = NormalizeDividerOffset(divider_at, bounds);
}
int divider_size =
!is_leading_visible || !is_trailing_visible ? 0 : kDividerSize;
if (is_horizontal_) {
*leading_bounds = gfx::Rect(0, 0, divider_at, bounds.height());
*trailing_bounds =
gfx::Rect(divider_at + divider_size, 0,
std::max(0, bounds.width() - divider_at - divider_size),
bounds.height());
} else {
*leading_bounds = gfx::Rect(0, 0, bounds.width(), divider_at);
*trailing_bounds =
gfx::Rect(0, divider_at + divider_size, bounds.width(),
std::max(0, bounds.height() - divider_at - divider_size));
}
}
void SingleSplitView::SetAccessibleName(const string16& name) {
accessible_name_ = name;
}
bool SingleSplitView::OnMousePressed(const MouseEvent& event) {
if (!IsPointInDivider(event.location()))
return false;
drag_info_.initial_mouse_offset = GetPrimaryAxisSize(event.x(), event.y());
drag_info_.initial_divider_offset =
NormalizeDividerOffset(divider_offset_, bounds());
return true;
}
bool SingleSplitView::OnMouseDragged(const MouseEvent& event) {
if (child_count() < 2)
return false;
int delta_offset = GetPrimaryAxisSize(event.x(), event.y()) -
drag_info_.initial_mouse_offset;
if (is_horizontal_ && base::i18n::IsRTL())
delta_offset *= -1;
// Honor the minimum size when resizing.
gfx::Size min = child_at(0)->GetMinimumSize();
int new_size = std::max(GetPrimaryAxisSize(min.width(), min.height()),
drag_info_.initial_divider_offset + delta_offset);
// And don't let the view get bigger than our width.
new_size = std::min(GetPrimaryAxisSize() - kDividerSize, new_size);
if (new_size != divider_offset_) {
set_divider_offset(new_size);
if (!listener_ || listener_->SplitHandleMoved(this))
Layout();
}
return true;
}
void SingleSplitView::OnMouseCaptureLost() {
if (child_count() < 2)
return;
if (drag_info_.initial_divider_offset != divider_offset_) {
set_divider_offset(drag_info_.initial_divider_offset);
if (!listener_ || listener_->SplitHandleMoved(this))
Layout();
}
}
void SingleSplitView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
divider_offset_ = CalculateDividerOffset(divider_offset_, previous_bounds,
bounds());
}
bool SingleSplitView::IsPointInDivider(const gfx::Point& p) {
if (child_count() < 2)
return false;
if (!child_at(0)->visible() || !child_at(1)->visible())
return false;
int divider_relative_offset;
if (is_horizontal_) {
divider_relative_offset =
p.x() - child_at(base::i18n::IsRTL() ? 1 : 0)->width();
} else {
divider_relative_offset = p.y() - child_at(0)->height();
}
return (divider_relative_offset >= 0 &&
divider_relative_offset < kDividerSize);
}
int SingleSplitView::CalculateDividerOffset(
int divider_offset,
const gfx::Rect& previous_bounds,
const gfx::Rect& new_bounds) const {
if (resize_leading_on_bounds_change_ && divider_offset != -1) {
// We do not update divider_offset on minimize (to zero) and on restore
// (to largest value). As a result we get back to the original value upon
// window restore.
bool is_minimize_or_restore =
previous_bounds.height() == 0 || new_bounds.height() == 0;
if (!is_minimize_or_restore) {
if (is_horizontal_)
divider_offset += new_bounds.width() - previous_bounds.width();
else
divider_offset += new_bounds.height() - previous_bounds.height();
if (divider_offset < 0)
divider_offset = kDividerSize;
}
}
return divider_offset;
}
int SingleSplitView::NormalizeDividerOffset(int divider_offset,
const gfx::Rect& bounds) const {
int primary_axis_size = GetPrimaryAxisSize(bounds.width(), bounds.height());
if (divider_offset < 0)
// primary_axis_size may < kDividerSize during initial layout.
return std::max(0, (primary_axis_size - kDividerSize) / 2);
return std::min(divider_offset,
std::max(primary_axis_size - kDividerSize, 0));
}
} // namespace views
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